R. O. Samui Drinking Water, this company is for 20 years in business and produces bottled drinking water for hotels such as Four Seasons Samui, Amari, Infinity, Kamalaya, Bandara and the Farmer. They claim that their water is purified by reverse osmosis and an ozone/UV combination. Offering water in plastic bottles and glass bottles. They have English speaking staff and they are offering delivery service.